CaTiO_3∶Pr纳米荧光粉的制备及其光谱性质研究  

Synthesis and optical properties of Pr doped CaTiO_3 nanophosphors

作　　者：袁思成 谢盼平 胡立坤 郑峰[1] YUAN Sicheng;XIE Panping;HU Likun;ZHENG Feng(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《功能材料》2019年第5期5132-5137,共6页Journal of Functional Materials

摘　　要：通过共沉淀法制备了掺镨(Pr)的纯相CaTiO_3∶Pr纳米荧光粉。采用差热和热重分析(DSC/TG),X射线衍射仪(XRD),荧光光谱仪(PL)研究了前驱体和荧光粉的热动力学行为,晶体结构和光学性能。讨论了前驱体在煅烧过程中所经历的化学反应,研究了pH值和掺杂浓度对CaTiO_3结构和性能的影响。结果表明,升高pH值可以明显减少晶体内部缺陷,却不改变晶粒尺寸;当pH值和Pr^(3+)离子掺杂浓度分别为8.5和0.1%(原子分数)时,荧光粉的发光性能最好。光谱分析结果表明,Pr^(3+)离子间的电偶极作用是产生浓度淬灭效应的主要原因。Pure praseodymium doped calcium titanate nanophosphors with average grain size of 56 nm was synthesized by coprecipitation and followed by sintering at 900 ℃. Thermodynamic behavior,crystal structure and optical properties of precursors and CaTiO 3∶Pr nanophosphors were studied by DSC/TG,XRD and PL,respectively. Specific reaction processes during calcination of precursors,and effect of pH and Pr^ 3+ doping concentration on structure and properties of CaTiO 3∶Pr powders were examined and discussed in detail. Experimental results showed that grain size of CaTiO 3∶Pr nanophosphors was consistent regardless of pH (5.5-8.5),but increasing pH was beneficial to luminescent performance due to decrease of microstrain inside grain. Optimal Pr^ 3+ doping concentration was determined to be 0.1 at%. The results of spectral analysis showed that electric dipole action was dominant cause of concentration quenching effect.

关 键 词：CaTiO3∶Pr 共沉淀 反应动力学 PH值 浓度淬灭 

分 类 号：TB383[一般工业技术—材料科学与工程]